Variable speed hydraulic coupling



March 20, 1945. K. Y SAITQ 2,37L92 VARIABLE SPEED HYDRAULIC COUPLNG Filed March 17, 1941 2 sneets-sheet 1 IIII Fig L I 2? J0 JI 9 l A .Z6

l 2 i x r 6 E: L L1 16 72 t? J7 A TTORIVEYS1 March zo, 1945.

K. SAITO VARIABLE SPEED HYDRAULIC COUPLING Filed March 17, 1941 2 Sheets-Sheet 2 INVENToR.

Patented Mar. 2o, 194s Kimm sano, Uruao, summa-ken,

Japan; vested in the Alien Property Custodian Application March 17, r1941, serial No.

In Japan April 5, 1940 3 Claims. (Cl. 60-53) y i This invention relates to variable speed hydraulic couplings, and has for its object to provide an improved construction of this class, having eccentric rotary pumps, one of which may be adjusted in eccentricity to control the flow of fluid into the other pump, whereby the latter pumpmay be controlledinoperation.

In the accompanying drawings:

Fig. 1 is a vertical sectional view of a hydraulic coupling embodying the invention;

Fig. 2 is a sectional view, the left half taken on the line II-II and the right half taken on the line II-II' of Fig. 1;

Figs. 3-6 are diagrammatic views illustrating the operative relations between the eccentric rotary pumps on driving and driven sides.

Referring to the drawings, a driving shaft I and a driven shaft 2 extend in an alinement into a closed casing 3, for examplecomprising a body 4 and a cover member 5, through in a huid-tight relation opposite hubs 6 and 1 provided in the cover member and the casing is provided with an internal cylindrical case member 8 integral with or secured to the casing, whereby the casing is divided into inner and outer chambers. A part of the inner wall of the internal cylindrical case member 8 is adapted to receive a cylinder 9 for an eccentric rotary. pump associated with the driving shaft in the casing 3, through the intermediary of an adjusting ring I whereby the cylinder 9 may be adjusted to positionin concentric or in various eccentric relation as desired to the driving shaft I, whilethe other part is adapted to receive a cylinder I I for an eccentric rotary pump associated with the driving shaft 2 in the casing 3.

The driving shaft l carries a rotor I2 for the eccentric rotary pump, secured to its inner end in the cylinder 9. The rotor I2 has a smaller diameterthan the inner diameter of the cylinder 9, so as to leave a suitable space between the cylinder 9 and the rotor a number of radial movable blades I3 supported by means of helical springs I4 in slots I5 provided in the rotor I2 for that purpose.

The cylinder II for the eccentric rotary pump associated with the driven shaft 2 may be integral 'with as shown or secured to the rotator I2 for the eccentric rotary pump associated with the driving shaft I. The inner circumferential I is in an eccentric rela- Similarly to the driving shaft I, the driven I2, and is provided with body respectively. The

, ber 30 respectively.

shaft 2 carries a rotor I6 for the eccentric rotary pump'secured to its inner end in the cylinder II. The rotor I 6 has a smaller diameter than the inner diameter of the cylinder II, so as to leave a suitable space between the cylinder II and the rotor I6, and is provided with a number of radial movable blades I1 supported by means of helical springs I8 in slots I9 providedin the rotor I8 for that purpose.

The cylinder 9 is provided with ports 20 and 2I, the adjusting ring I0 ports 2 2 communicate with the ports 20 and 2| respectively, and the cylinder I I ports 24 and 25. The internal cylindrical case member 8 is provided with circumferential series of ports 26, 21, 28 and 29 adapted to communicate with the vports 20, 2 I, 22 and 23 respectively, and is provided with 'a circumferential annular chamber 30 including the ports 21 and 28. Spring loaded safety valves 3| and 32 are provided for limiting uid pressure in the outside and the inside of the annular cham- For the operation of the adjusting 'ring I0 and the cylinder 9 to adjust the cylinder 9 in a concentric or various eccentric positions to the driving shaft I, the adjusting ring I0 is provided with a circumferential flange with teeth 33, the cylinder 9 a circumferential flange with. teeth 34. The teeth 33 engaged with a toothed wheel 35 which may be driven site to that of the driving shaft I, and thence the iiuid will be forced through the ports 24 and 29 into the annular chamber 30, the fluid being thus circulated.

and 23 adapted to In each cycle of the fluid, if the volume of thev fluid leaving the cylinder 9 during one complete revolution of the rotor I2 is the same as the volume of the fluid leaving the cylinder II during one complete revolution of .the rotor I6.' the driven shaft 2 will remain stil1,.as the cylinder II rotates with the driving shaft I. In accordance with whether the former volume of the uid is larger or smaller uid, the driven shaft 2 will be driven in a direction opposite to or the same direction as that of the driving shaft I.4 By so making the cylinder 9 that it may contain larger volume of fluid by a suitable volume than the volume of the fluid' which may be filled in the cylinder II, and by the regulation of the volume of the fluid forced from the cylinder 9 into the cylinder Ii by changing the relative position of the cylinder 9 to the rotor I2 by means of the adjusting ring l0, the driven shaft 2 may be driven at variable speed, even smaller or larger than the speed of the driving shaft I. in a. direction opposite to or the same direction as that ofthe driving shaft I.

This will be illustrated in detail with reference to Figs. 3-6.

With the cylinder 9 in the rotor I2, as shown in Fig. 3, so that the volume of fluid discharged from the cylinder 9, during one complete revolution of the driving shaft I is larger than the volume of fluid that can be admitted by cylinder II, during one complete revolution of cylinder II relative to rotor I6, in order to accommodate the diiferencein volume, rotor I6 must rotate in the direction indicated by the arrow, and hence the driven shaft 2 will be driven in the opposite direction to the direction of the driving shaft i.

With the cylinder 9 in the relative position to the rotor I2, as shown in Fig. 4, so that the volume of fluid discharged from the cylinder 9, during one complete revolution of the driving shaft i is equal to the volume of fluid that can be accommodated by cylinder ii, during one complete revolution of cylinder II relative to rotor I6, the

- driven shaft 2 will remain still, as the cylinder I I is driven with the shaft I.

With the cylinder 9 in the relative position to the rotor I2, as shown in Fig. 5, so that no fluid is discharged from the cylinder 9, during rotation of the driving shaft I as the cylinder Il rotates with the rotor I2 on the driving shaft and no fluid can be accommodated at cylinder 9, a fluid lock condition is obtained so that rotor IB must rotate with cylinder II. In 'this case, the driven shaft 2 will be driven in the same direction as the driving shaft I, the cylinder 9 being concentrically positioned to the rotor i2.

Finally, with the cylinder 9 in the relative position to the y fluid will apparently enter in the cylinder 9 through the port instead of the port 2I and discharge through the port 2i instead of the port 20, and will enter into the cylinder the port 24 instead of the port 25 and discharge through the port 25 instead of the port 2l, in the opposite direction tothat shown in Fig. 3. Thus, the rotor I6 and hence the driven shaft 2 will be driven in the same direction as the driving shaft I and hence the cylinder I I,'at a speed greater than shaft l in accordance with the volum@ of fluid discharging from the cylinder 9.

I claim:

the relative position to than the latter volume of the 1. A variable speed hydraulic coupling comprising a casing, an interior cylindrical case member having a circumferential annular chamber, said internal Acylindrical case member being provided with a plurality of portsy therethrough which communicate with said annular chamber and with the space between the outside of the internal cylindrical case member and said casing, a driving and driven shaft extending in alinement into the chamber, an eccentric rotary pump comprising a cylinder mounted in a part of the internal cylindrical case member and provided with a series of ports, an adjusting ring on said rotary pump cylinder also provided with a series, of ports cooperating with ports of the internal cylindrical case'member, means for actuating saidv ring to adjust said pump as to its relative position to the driving shaft, a rotor secured to the inner end of the driving shaft and having a plurality of radially movable blades, the feed from said pump being variable through the cooperating ports of the cylindrical case member and adjustable ring ports by manipulation of the adjusting means, a second eccentric rotary pump comprising a second cylinder mounted in another part of the internal cylindrical case member, said second cylinder having ports therethrough, a rotor in said second cylinder secured to the driven member and having ,a 'number of radially movable blades, the second cylinder being carried by the rotor on the driving shaft, said second cylinder being provided with a plurality of ports which communicate with ports in said internal cylindrical case member.

2. A variable speed hydraulic coupling including an enclosed fluid tight casing provided with aligned apertured hubs for respectively receiving the ends of a driving' and a driven shaft, an internal cylindrical case member within the casing and dividing the same into inner and outer chambers, an eccentric rotary pump comprising a cylinder mounted within a part of the case member and surrounding the driving shaft, an adjusting ring interposed between the cylinder and the case member, means coupling the adjustingmeans to the cylinder to adjust its relative position with respect to the driving shaft,

`and a rotor arranged within the cylinder, se-

rotor l2, as shown in Fig. 6, the

I I through cured to the inner end of the driving shaft and having a number of radially movable blades mounted thereon, and a second eccentric rotary pump in axial alignment with the first mentioned pump comprising a cylinder arranged within the other part of the internal cylindrical case member, surrounding the driven shaft and mounted on the rotor secured to the driving shaft and having its outer circumferential faces concentric with respect to the driving shaft, and a rotor secured to the inner end of the driven shaft and having a number of radially movable blades mounted thereon whereby rotation of the driving shaft is transmitted through .the pumps to the driven shaft.

3. A variable speed hydraulic coupling as claimed in claim 2 in which the cylindrical case member is integral with the casing and the cylinder surrounding the driven shaft is integral with the rotor secured to the inner end of the driving shaft.

KIITIRO SAITO. 

